A bacterium that lacks the mreB gene will have a ________ shape
A) bacillus
B) coccoid
C) short bacillus
D) vibrio
Answer: B
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A single human cell encloses about 1.5 meters of DNA containing 4.5 billion base pairs. How far apart are these base pairs in the DNA?
a. 3.3 × 10^?10 nm b. 3.3 × 10^10 nm c. 3 × 10^9 nm d. 300 nm e. 0.33 nm
Which is NOT true about gene mutations?
a. All are transmitted to the next generation. b. They are rare but their rates can be predicted. c. Those with beneficial effects will be favored by natural selection. d. Many reduce an individual's chance of surviving and reproducing. e. Those with neutral effects neither help nor hurt the individual.
A(n) ____________________ growth is potentially harmful. Fill in the blank(s) with the appropriate word(s)
Motile bacteria have been placed in an environment with a gradient of a chemical attractant. Which of the following behaviors would you predict?
A. The bacteria will only exhibit runs away from the chemical. B. The bacteria will reduce run duration in the direction of the chemical. C. The bacteria will reduce tumbling frequency. D. Bacteria will randomly switch back and forth between runs and tumbles. E. The bacteria will both reduce tumbling frequency and increase run duration in the direction of the chemical.